llvm-project/llvm/test/Transforms/InstCombine/strrchr-1.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; Test that the strrchr library call simplifier works correctly.
; RUN: opt < %s -instcombine -S | FileCheck %s

target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"

@hello = constant [14 x i8] c"hello world\5Cn\00"
@null = constant [1 x i8] zeroinitializer
@chp = global i8* zeroinitializer

declare i8* @strrchr(i8*, i32)

define void @test_simplify1() {
; CHECK-LABEL: @test_simplify1(
; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 6), i8** @chp, align 4
; CHECK-NEXT:    ret void
;

  %str = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
  %dst = call i8* @strrchr(i8* %str, i32 119)
  store i8* %dst, i8** @chp
  ret void
}

define void @test_simplify2() {
; CHECK-LABEL: @test_simplify2(
; CHECK-NEXT:    store i8* null, i8** @chp, align 4
; CHECK-NEXT:    ret void
;

  %str = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
  %dst = call i8* @strrchr(i8* %str, i32 119)
  store i8* %dst, i8** @chp
  ret void
}

define void @test_simplify3() {
; CHECK-LABEL: @test_simplify3(
; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13), i8** @chp, align 4
; CHECK-NEXT:    ret void
;

  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
  %dst = call i8* @strrchr(i8* %src, i32 0)
  store i8* %dst, i8** @chp
  ret void
}

define void @test_simplify4() {
; CHECK-LABEL: @test_simplify4(
; CHECK-NEXT:    store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13), i8** @chp, align 4
; CHECK-NEXT:    ret void
;

  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
  %dst = call i8* @strrchr(i8* %src, i32 65280)
  store i8* %dst, i8** @chp
  ret void
}

define void @test_nosimplify1(i32 %chr) {
; CHECK-LABEL: @test_nosimplify1(
; CHECK-NEXT:    [[DST:%.*]] = call i8* @strrchr(i8* nonnull dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 0), i32 [[CHR:%.*]])
; CHECK-NEXT:    store i8* [[DST]], i8** @chp, align 4
; CHECK-NEXT:    ret void
;

  %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
  %dst = call i8* @strrchr(i8* %src, i32 %chr)
  store i8* %dst, i8** @chp
  ret void
}

define i8* @test1(i8* %str, i32 %c) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    [[RET:%.*]] = call i8* @strrchr(i8* nonnull dereferenceable(1) [[STR:%.*]], i32 [[C:%.*]])
; CHECK-NEXT:    ret i8* [[RET]]
;

  %ret = call i8* @strrchr(i8* %str, i32 %c)
  ret i8* %ret
}

define i8* @test2(i8* %str, i32 %c) null_pointer_is_valid {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    [[RET:%.*]] = call i8* @strrchr(i8* [[STR:%.*]], i32 [[C:%.*]])
; CHECK-NEXT:    ret i8* [[RET]]
;

  %ret = call i8* @strrchr(i8* %str, i32 %c)
  ret i8* %ret
}